Electrical Engineering Interview Questions
Questions Answers Views Company eMail

In the Load Test of 3 Phase Squirrel Cage Induction Motor, 2 wattmeters are used. One of the wattmeter deflects in negative diretion during no load. Why?

CAT,

1 8466

How to design the blower for motor? how to two blowers connected in motor?

Ashok Leyland, TATA,

1 3655

what is Diversity factor in electrical installations

3 13894

how to decide the ratings of the MCCB,MCB in electrification.give me the proper thumb rule or procedure.

ABB,

2835

how to decide the ratings of the busbar in electrification.give me the proper thumb rule or procedure

ABB,

1 4156

why excitor coil of an alternator can fail

3 4906

66kv under ground cable how to layaing in ground any special case two ckt r runing

1582

From an electrical motor & electrical generator, which has more efficiency & why?

Sahi,

1 2294

why we change the direction of winding in rotor ?how we make the north and south pole?

1618

why we r using alternator instead of d.c generator and induction generator

1 3090

why alternator is used instead of dc generator and induction generator

1 3092

what is the full form of KVAR

6 32022

what is ripple ??? what is harmonics ?

ABB,

3 12496

how much current in live 11 Kv distribution Line?

ABB,

1 4907

If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV?

L&T,

3 6594


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Un-Answered Questions { Electrical Engineering }

what are the things that can cause a three phase motor to crawl?

2924


Trafo ratio is 11kV/6.6kv,Vector group is YND11. What will be the effect if secondary is used for earthed system.

3389


Why are iron cores in transformers made laminated?

700


how the testing of protection CT Testing done through Primary injection kit please describe in detail procedure...

1828


State uses of different types of stsrters with different capacities of motors as below: a. up to 5HP b. above 5hp to 10hp c. above 10hp to 20hp d. above 20hp

1516






importance of reactive power management

1620


what is the difference between surge protection capacitor and surge arrestor

1851


From what on-site components does the HT panel monitoring the bus-bars in a 11kV system take inputs?

1552


Please brief what is sinewave

1759


how can we make cable shedule for controll wiring ? which details must be required for it.?

1685


Which of the following alternatives will be cheaper (1) A 100 h.p AC, 3-phase motor (2) Four motors of 25 h.p each (3) Five motors of 20 h.p each (4) 10 motors of 10 h.p each explain

2551


how to select proper cable for ct wiring so that drop within the limit.

1500


Whether the vacuum contactor requires Short circuit protection?If No,why?

1620


which are the criterias needed to select the kind of neutral earthing(solid earthing,resistance earthing,etc.) at various voltage levels in electrical distribution?

1534


How to determine the breaking capacity such as break down current and break down voltage for VCB and CT's.

1782